will 2024-0 clad 3032 aluminum work for belly pans. located some that is 48" X 144" locally at 50.00 a sheet? Is this good or bad. Is it ok to run the belly pan front to back in 48" widths riveted to the rails cut to length side to side?

The price is good, for sure. I think you could make it work. O is very easily crinkled, kinked and dented. It is typically used to form a part or piece then tempered in an oven (heat treating). I'm sure it would be better than .020 3003 that was originally used in the 70s.
I prefer to use .025 6061 T6 for belly pans.